I installed the update this morning...
biggest things I don't seem to like it is made the resolution larger so now everything looks smaller font, menus and images wise. however, I can adjust the font and help correct it some.
I don't like the new lock screen. it's made it so that my music player's (Amazon music) lock screen windows is at the top instead of bottom and it's all white text with no background so it's hard to read the text unless my wallpaper happens to be a dark color. which I could change the lock screen back.
other then that... don't use blink feed so don't care about that one. also don't use HTC's camera. Google's is much better, especially when it comes to editing options.